Try some AWG14 and see if it snaps in. If it does, I think you've answered your own question. Since it's a light switch, they probably assume the wiring will always be 14. Lots of "conventional" backstab devices will only accept 14 as well.

I agree with Alectrician about how hard it is to work on this stuff, but in terms of driving down costs, the manufactured home industry has been pretty effective.

God I hate that crap. Impossible to troubleshoot. The last triler I was in, I had to replace a crapload of boxes and regular outlets trying to find a fault.

I pass on the trailer service calls now.

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A lot of people own trailers around here, so I can't afford to pass on those calls.

One time, I had to crawl under a double-wide to find a loose connection between the two halves of the trailer. There were mice, snakes, skunks, lizards, broken beer bottles, old pizza, dog crap, and every other kind of "trailer trash" you can imagine under there.

One trick that I try is dressing up but then that would depend on what you were planning on doing.
I mean one would still look like a complete idiot if they wore a tux to a dicth digging.

Sometimes looking like an idiot comes in handy, take me for example, no one ever asks me to help do anything so I just stand around looking.... well you know at least I am not the one working their butts off.

Those special switches and outlets without a real box are sometimes all that will fit in the thin walls in those trailers. The cable is clamped between the two pieces of plastic and you don't need to meet any "box volume" requirements.

I don't see a release button, so I might not even be able to re-use it once I figure out how to connect the darn wires.

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Looks like the rear half of the case pushes the wire down between the two prong-thingies that go through the insulation and contact the wire, much like communication wiring uses a punchdown block and tool. When you separate the back of the box from the front, you should be able to pull the wires out from the prongs with pliers. Whether the thing is reusable or not I can't say, but I reuse Cat5 punchdown connectors regularly, even the small plastic individual jacks.

Ca't really tell from the pictures, but it looks like the hard part might be pulling the two halves of the box apart -- those one-way snap-together pieces are a little scary.